@charset "utf-8";
*,
*:before,
*:after {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}
html,
body {
  padding: 0;
  margin: 0;
  height: 100%;
}
body {
  background-color: #333;
  display: -webkit-box;
  display: -moz-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: box;
  display: flex;
  -webkit-box-flex: 1;
  -moz-box-flex: 1;
  -o-box-flex: 1;
  box-flex: 1;
  -webkit-flex: 1;
  -ms-flex: 1;
  flex: 1;
  -webkit-box-orient: horizontal;
  -moz-box-orient: horizontal;
  -o-box-orient: horizontal;
  -webkit-box-lines: multiple;
  -moz-box-lines: multiple;
  -o-box-lines: multiple;
  -webkit-flex-flow: row wrap;
  -ms-flex-flow: row wrap;
  flex-flow: row wrap;
}
.flex__item {
  display: -webkit-box;
  display: -moz-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: box;
  display: flex;
  -webkit-box-flex: 1;
  -moz-box-flex: 1;
  -o-box-flex: 1;
  box-flex: 1;
  -webkit-flex: 0 0 50%;
  -ms-flex: 0 0 50%;
  flex: 0 0 50%;
  height: 50%;
  background-color: #777;
  border: 1px solid #000;
}
.flex__item:nth-child(1) {
  background-color: #9aa0a8;
}
.flex__item:nth-child(2) {
  background-color: #a7c4b5;
}
.flex__item:nth-child(3) {
  background-color: #a9d8b8;
}
.flex__item:nth-child(4) {
  background-color: #beffc7;
}